Power transmission device



June 23, 1931, F. B. BARRER l POWER TRANSMISSION-DEVICE Filed Oct. l1. 1929 2 Sheets-Sheet l June 23, 1931. F. B. BARRER 1,811,293

POWER y'I'RNSMISSICH DEVICE Filed oct. 11, 1929 2 sheets-sheet 2 v Egg.

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by, @www Patented .lune 23, 1931 PATENT OFFIQE FERNAND BERTRAND BARRER, OF HAUTAGET, FRANCE rowirn` rneivsivrrssroiv DEVICE l Application filed October 11, 1929, Serial No. 399,060, and in' France Gctober 18, 1928.

l, The present inventionhas for its object a power transmission device, which affords, by

means of gears permanently in mesh, subl stantially four different'ratios of transmis- 5 sion;

l This device is mainly characterized in that the driving shaft, on the one hand, and the driven shaft, on the other hand, have their opposite ends provided with clutching means lo witha movable hollow drum, andinove respectively, by means of gears permanently in mesh, a coaxial sleeve also provided with clutching means with the said hollow drum, usothat the latter may positively connect,

i5 according to its position, the driving shaft `(orits drum) wherebyto realize four dif-` ferent speed combinations.`

In the accompanying drawings, is shown an embodiment of my invention, by way of example only. I'

F igurel is a sectional view,t in elevation.

Figure 2 is a cross section taken on the Vline A-A of the Fig. 1.

Figure 3 is a cross section taken on the :l line B-B of the Fig. 1.

Figure 4 is a diagrammatical view of a modification, in which an intermediate shaft is interposed between the shafts.

The gearing device shown on the accompanying drawing, is primarily intended to be used as a change-speed mechanism, upon the motor vehicles, and is provided with a mov-- able. hollow drum 3,' adapted to be longi- 'N tudinally displaced, by any suitable means, and sleeves 1a and 2a respectively mounted .upon the drive shaft 1, and upon the driven shaft 2; the drum and the sleeves are respectively mounted opposite to the shafts 1 and 2. The hollow drum 3 is concentric to the shafts l and 2, which are disposed, in the embodiment described and shown, in alignment. A toothing 1b, cut either directly on the shaft 1, or on a sleeve 1C firmly secured on the shaft 1, continuously engages another toothing 1d cut .in a rim 1e of a gear wheel. rFhis gear wheel, which is mounted in a bearing 1f, is provided with an external toothing 1g which meshes a toothing 1h, cut ina rim 1 of a gear wheel, which forms part of the sleeve 1a in which is engaged the shaft '1. At its free end, the

sleeve 1a is provided with clutch teeth 1j,

ft is obvious, according to the change-speed unit arrangement, that the toothing 1j may he cut, either directly on the sleeve 1, or or. r

a removable member carried by the same.

A hollow drum 2", keyed on the shaft 2,

Y is provided with an external toothing 2C used for the backward running andan internal toothing 2a which permanently engages -r toothing 2e cut upon the external part of another hollow drum 2f. rllhis drum, which is mounted in a bearing 2g is provided with an internal toothing 2h which meshespermanently with a toothing 2i cut on the hollow drum 2, in which is engaged the driven shaft 2.

At its free end, this latter shaft is provided with a central nipple 2j, which enters a central cylindrical recess 1k provided at the free end of the shaft 1. Clutchteeth 2k, placed as shown in the drawing, is secured upon the shaft 2. Clutch teeth 11, integral with the shaft l, are provided at the free end on the Same.

' The hollow drum 3 is provided with internal toothings 3a, 3b, 3c, 3d and 3G, which are preferably cut directly into the drum, but which may be previously cut into independent rims, rigidly secured into the said drum.

-member 4 and. in which are engaged keys 3 secured, on the one hand, to the hollow drum 3 and, on the other hand, to a ring 3g, as

shown in the accompanying drawing. ThifV i arrangement permits longitudinal displace- Iment of the drum 8, by the intermediary of an operating fork 5, the arms of which are engaged in an annular groove 3h of the ring 3g. The drum 2a is provided as shown in the drawings, with toothing 21 and 2W. f

The speed reducing device, constituted by gearings or hollow drums provided with toothings 1b, 1d, 1g and v1h allows to obtain a ratio of transmission K1. The speed reducing device constituted by gearings or hollow drums provided with toothings 2c, 2d, 2e, 21l and 21, allows to obtain a ratio K2. By associating these speed reduc-ing devices, it` is possible to obtain the first speed which corre-V sponds tothe ratio: K1 XKZ. In interposing only the speed `reducing-device of ratio K1 between thedriving shaft land the driven fand2.. Y 'Y The 'ope'ratlonfof the power transmission `device accordingto'the present invention, 1s

shaft 2, it is possible to obtain the second speed, the ratio'ofrwhich is K1. The third speed is obtained in interposing, between these shafts, Yonly the speed .reducingdevice of ratio K2. The fourth speed is obtained by rotatably' connectingthe twoV shafts 111 caused by suitable slidableV displacements of the hollow drum 3, in such a manner as'to engage suitable gearings.

'The first speed is obtained by engaging the .toothings 39,21 anda, 11.

The second speed is obtained by engaging the ftoothings 3, 2k and v31, Y11. Y rIhe'third speed is obtained engaging 1 the toothings 39,121 and 3c, 11.

. The fourth speed is Vobtained by engaging the toothings 3d, 211 and 3c., 11. The present power Atransmission device has 'the great Vadvantage of being substantially noiseless, from the'fact that use is `made of annular gears and p ini'ons, which may be of any suitable types] i In` some cases, lthe shaft 2 may be used asvr an intermediate shaft for driving the drivenshaft, either directly or by the intermediary f of a changespeed mechanism which :might 'speedll'ever, in such a .manner as to reduce Y iothe four speeds previously obtained. Thus,

be, for instance,controlled bythe changethis arrangementl -would allow .to obtain .eight l .difierentspeeds '1 .Y The .reverse gear device is of the ordinary type, provided Vwith a sliding gear. 4 Thisarv rangement ispartly shown in Fig; 1 asa shaft 6 which Vcarries Athe'toothed gears 6a :and 161.

Referring to IFig.4,is shown a modificato each'of these shaftsl and v2', by means .of drums 3 and 3f .and .speed reducing units.

fx1"- NH12, -Sm'laltothe units of the'previous example. l

1.' In a powerrtransmission device, a driving shaft, a first sleeve turning on the driving shaft,'1neans for connecting the driving shaft to the said first sleeve whereby the angular speeds of the driving shaft and the said first sleeve are different, a driven shaft, a secvond sleeve turningonthe driven shaft, means for connecting the driven shaft to the said second sleeve whereby the angular speeds v of the driven shaft and the said second sleeve f aredifferent, couplingmeans carried by the driving shaft, by the driven shaft, by the first sleeveV and by the second sleeve, and

other coupling means associated with the .pre-V ceding meansfor rigidly Aassociating the drivingshaft or the tsleeveturning thereon 4with the drivenshaftor theV sleeve turning thereon. Y y Y Y f 2. Ina power transmission device, a Adriving shaft, a first sleeve turning on the driving shaft, gears for connecting the driving-shaft to the said yfirst sleeve whereby the angular speeds of the driving shaft and the'said first sleeve are different, a driven shaft, a second sleeve turning on the driven'shaft, .gears for Aconnecting the driven shaft tothe saidseco-nd sleeve so .that the .angularspeeds ofthe `driven Vshaft and the said second sleeve are Ydiffer- "tion of the-described devicein which both 1 the shaftsl and 2 are connected together by an intermediateshaftlO, whichV is connected The simultaneous and continuous/i control 1 of ythedrums f3.and 3, .by means of' a comf "mon' lever, may be .obtained in any known *mannen Y It is'V obvious .that .the describedjembodi- Yment,"sho wn by way .ofexample only, may be modified, .as well concerning the constitu- Y relative positioning of the same.

Y vVhat Iv'clairn, as f my invention and desire i to-secure ibyiliietters Patent, -ifs:'- Y

V'tion ofthe different parts, as concerning the e 

